Long post but here's my favourite metal albums of the year:
Agoraphobic Nosebleed - Arc EP (doom)
Anaal Nathrakh - The Whole of the Law (black metal / grind)
https://www.youtube.com/watch?v=hzghSOZW7Zk
Blood Incantation - Starspawn (death)
https://www.youtube.com/watch?v=pXrVZl4_seI
Car Bomb - Meta (mathcore... whatever the heck that is)
https://www.youtube.com/watch?v=bUVcnsiRQ4M
Chthe'ilist - Le Dernier Crépuscule (atmospheric death)
https://www.youtube.com/watch?v=YxqzffNjGdI
Church of Misery - And Then There Were None... (death / doom)
Cobalt - Slow Forever (black)
https://www.youtube.com/watch?v=0CbeJydbYu0
Darkthrone - Arctic Thunder (black / thrash)
https://www.youtube.com/watch?v=fUs0nCyrWWM
Defeated Sanity - Disposal of the Dead / Dharmata (technical death)
Devin Townsend Project - Transcendence (progressive)
https://youtu.be/44TzcehU0V8?t=1420
Fleshgod Apocalypse - King (symphonic death)
Gadget - The Great Destroyer (grind)
https://www.youtube.com/watch?v=s7gT7I0aHSc
Gatecreeper - Sonoran Depravation (death)
https://www.youtube.com/watch?v=fptY_BZe9HE
Ghoul - Dungeon Bastards (death / thrash)
https://www.youtube.com/watch?v=OKc2G4N6q7E
Ghoulgotha - To Starve the Cross (death / doom)
https://www.youtube.com/watch?v=9to57DD9eyw
Gruesome - Dimensions of Horror (progressive death)
https://www.youtube.com/watch?v=pCjyHthOIHY
Hammers of Misfortune - Dead Revolution (heavy metal)
Ihsahn - Arktis. (progressive black)
https://www.youtube.com/watch?v=0VxbJb_Gs8w
Nails - You Will Never Be One of Us (grind)
https://www.youtube.com/watch?v=aPVt9yR8t2o
Oranssi Pazuzu - Värähtelijä (psychedelic black)
https://www.youtube.com/watch?v=v2V-ftsPqV0
Phazm - Scornful of Icons (black / death / doom)
https://www.youtube.com/watch?v=VDvQmm2N1Es
Rotten Sound - Abuse to Suffer (grind)
https://www.youtube.com/watch?v=m1Z4fkrADUY
Ulcerate - Shrines of Paralysis (death)
https://www.youtube.com/watch?v=DVgVXGjDkVM
Vektor - Terminal Redux (black / thrash)
https://www.youtube.com/watch?v=-4e5Jw9T5Zk
Volbeat - Seal the Deal & Let's Boogie (heavy metal)
https://www.youtube.com/watch?v=5T60KuDDyJ8
Wormed - Krighsu (death metal / grind)
https://www.youtube.com/watch?v=4Bqb_b1UOnQ
Wormrot - Voices (grind)
https://www.youtube.com/watch?v=DrRhYE3GRs4
Honourable Mentions to Fallujah, Gojira, Kvelertak, Meshuggah, and Metallica.